AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper167.cs

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2024-08-03 23:15:19 +08:00
//////////////////////////////////////////////////////////////////////////
// Mapper004 Supor Computer V4.0 //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
using System;
using Codice.CM.Client.Differences;
namespace VirtualNes.Core
{
public class Mapper167 : Mapper
{
BYTE[] regs = new byte[4];
BYTE rom_type;
public Mapper167(NES parent) : base(parent)
{
}
public override void Reset()
{
uint crc;
regs[0] = 0;
regs[1] = 0;
regs[2] = 0;
regs[3] = 0;
crc = nes.rom.GetPROM_CRC();
if (crc == 0x82F1Fb96)
{
// Subor Computer(Russia)
rom_type = 1;
}
else
{
// Subor Computer(Chinese)
rom_type = 0;
}
SetBank_CPU();
SetBank_PPU();
}
//void Mapper167::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
int idx;
idx = (addr >> 13) & 0x03;
regs[idx] = data;
SetBank_CPU();
SetBank_PPU();
// DEBUGOUT("write to %04x:%02x\n", addr, data);
}
void SetBank_CPU()
{
int @base, bank;
@base = ((regs[0] ^ regs[1]) & 0x10) << 1;
bank = (regs[2] ^ regs[3]) & 0x1f;
if ((regs[1] & 0x08) != 0)
{
bank &= 0xfe;
if (rom_type == 0)
{
SetPROM_16K_Bank(4, @base + bank + 1);
SetPROM_16K_Bank(6, @base + bank + 0);
}
else
{
SetPROM_16K_Bank(6, @base + bank + 1);
SetPROM_16K_Bank(4, @base + bank + 0);
}
// DEBUGOUT("32K MODE!\n");
}
else
{
if ((regs[1] & 0x04) != 0)
{
SetPROM_16K_Bank(4, 0x1f);
SetPROM_16K_Bank(6, @base + bank);
// DEBUGOUT("HIGH 16K MODE!\n");
}
else
{
SetPROM_16K_Bank(4, @base + bank);
if (rom_type == 0)
{
SetPROM_16K_Bank(6, 0x20);
}
else
{
SetPROM_16K_Bank(6, 0x07);
}
// DEBUGOUT("LOW 16K MODE!\n");
}
}
}
void SetBank_PPU()
{
SetCRAM_8K_Bank(0);
}
//void Mapper167::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = regs[0];
p[1] = regs[1];
p[2] = regs[2];
p[3] = regs[3];
p[4] = rom_type;
}
//void Mapper167::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
regs[0] = p[0];
regs[1] = p[1];
regs[2] = p[2];
regs[3] = p[3];
rom_type = p[4];
}
public override bool IsStateSave()
{
return true;
}
}
}